Work in progress…
Based on WiiController, a fork of WJoy by alxn1 (released under BSD 2-Clause License),
Open the .xcworkspace in Xcode, and run the scheme "ca.igregory.VHIDTest". When prompted, allow the new system extension.
hidutil list
systemextensionsctl list
systemextensionsctl uninstall - ca.igregory.VirtualController.dext